Little's Law
Calculate Little's Law instantly with the exact formula and a worked example.
Little's Law
Throughputpcs/day
Time in systemdays
Actual WIP (for check)pcs
Work in progress (WIP)
100pcs
Time in system at actual WIP
7.5days
Throughput needed at actual WIP
30pcs/day
More about: Little's Law
What it calculates
The “Little's Law” calculator computes Work in progress (WIP) in pcs from 3 parameters: throughput (pcs/day), time in system (days), actual wip (for check) (pcs).
A handy everyday calculator for daily tasks.
Example calculation
With parameters Throughput = 20 pcs/day, Time in system = 5 days, Actual WIP (for check) = 150 pcs the result is 100 pcs (WIP = throughput × time in system).
How to use
- Enter throughput, time in system and actual wip (for check) — each field above is adjustable with a slider.
- Work in progress (WIP) (pcs) is calculated automatically as you type.
- Check the worked example below to see the formula applied to real numbers.
- Copy the result or bookmark this calculator.
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FAQ
How is Little's Law calculated?
The Little's Law calculator computes Work in progress (WIP) (in pcs) from throughput, time in system, actual wip (for check). Enter your values above and the exact formula is applied instantly; a worked example with real numbers is shown below.
Is the Little's Law calculator free?
Yes. It is completely free, needs no signup, runs entirely in your browser, and sends no data to any server.
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